package com.example.exmweb.util;

import android.annotation.SuppressLint;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;

public class FileUtil {
	public static boolean isExternalStorageDocument(Uri uri) {
		return "com.android.externalstorage.documents".equals(uri.getAuthority());
	}

	public static boolean isDownloadsDocument(Uri uri) {
		return "com.android.providers.downloads.documents".equals(uri.getAuthority());
	}

	public static boolean isMediaDocument(Uri uri) {
		return "com.android.providers.media.documents".equals(uri.getAuthority());
	}

	public static String getDataColumn(Context context, Uri uri,
			String selection, String[] selectionArgs) {
		Cursor cursor = null;
		final String column = "_data";
		final String[] projection = { column };

		try {
			cursor = context.getContentResolver().query(uri, projection,
					selection, selectionArgs, null);
			if (cursor != null && cursor.moveToFirst()) {
				final int column_index = cursor.getColumnIndexOrThrow(column);
				return cursor.getString(column_index);
			}
		} finally {
			if (cursor != null)
				cursor.close();
		}
		return null;
	}

	@SuppressLint("NewApi")
	public static String getPath(final Context context, final Uri uri) {
		final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
		if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
			if (isExternalStorageDocument(uri)) {  //SD卡路径
				final String docId = DocumentsContract.getDocumentId(uri);
				final String[] split = docId.split(":");
				final String type = split[0];
				if ("primary".equalsIgnoreCase(type)) {
					return Environment.getExternalStorageDirectory() + "/" + split[1];
				}
			} else if (isDownloadsDocument(uri)) {  //下载目录
				final String id = DocumentsContract.getDocumentId(uri);
				final Uri contentUri = ContentUris.withAppendedId(
						Uri.parse("content://downloads/public_downloads"),
						Long.valueOf(id));
				return getDataColumn(context, contentUri, null, null);
			} else if (isMediaDocument(uri)) {  //媒体目录
				final String docId = DocumentsContract.getDocumentId(uri);
				final String[] split = docId.split(":");
				final String type = split[0];
				Uri contentUri = null;
				if ("image".equals(type)) {
					contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
				} else if ("video".equals(type)) {
					contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
				} else if ("audio".equals(type)) {
					contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
				}
				final String selection = "_id=?";
				final String[] selectionArgs = new String[] { split[1] };
				return getDataColumn(context, contentUri, selection, selectionArgs);
			}
		} else if ("content".equalsIgnoreCase(uri.getScheme())) {  //内容路径
			return getDataColumn(context, uri, null, null);
		} else if ("file".equalsIgnoreCase(uri.getScheme())) {  //文件路径
			return uri.getPath();
		}

		return null;
	}
}
